.\" $OpenBSD: X509_STORE_CTX_get_error.3,v 1.28 2023/06/06 16:20:13 schwarze Exp $
.\" full merge up to:
.\" OpenSSL man3/X509_STORE_CTX_get_error 24a535ea Sep 22 13:14:20 2020 +0100
.\" OpenSSL man3/X509_STORE_CTX_new 24a535ea Sep 22 13:14:20 2020 +0100
.\"
.\" This file is a derived work.
.\" The changes are covered by the following Copyright and license:
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.\" copyright notice and this permission notice appear in all copies.
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>
.\" and Rich Salz <rsalz@openssl.org>.
.\" Copyright (c) 2009, 2016 The OpenSSL Project.  All rights reserved.
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.Dd $Mdocdate: June 6 2023 $
.Dt X509_STORE_CTX_GET_ERROR 3
.Os
.Sh NAME
.Nm X509_STORE_CTX_get_error ,
.Nm X509_STORE_CTX_set_error ,
.Nm X509_STORE_CTX_get_error_depth ,
.Nm X509_STORE_CTX_set_error_depth ,
.Nm X509_STORE_CTX_get_current_cert ,
.Nm X509_STORE_CTX_set_current_cert ,
.Nm X509_STORE_CTX_get0_current_issuer ,
.Nm X509_STORE_CTX_get0_current_crl ,
.Nm X509_STORE_CTX_get0_parent_ctx ,
.Nm X509_STORE_CTX_get_num_untrusted ,
.Nm X509_STORE_CTX_get0_chain ,
.Nm X509_STORE_CTX_get_chain ,
.Nm X509_STORE_CTX_get1_chain ,
.Nm X509_STORE_CTX_set0_verified_chain ,
.Nm X509_verify_cert_error_string
.Nd get or set certificate verification status information
.Sh SYNOPSIS
.In openssl/x509_vfy.h
.Ft int
.Fo X509_STORE_CTX_get_error
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft void
.Fo X509_STORE_CTX_set_error
.Fa "X509_STORE_CTX *ctx"
.Fa "int s"
.Fc
.Ft int
.Fo X509_STORE_CTX_get_error_depth
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft void
.Fo X509_STORE_CTX_set_error_depth
.Fa "X509_STORE_CTX *ctx"
.Fa "int depth"
.Fc
.Ft X509 *
.Fo X509_STORE_CTX_get_current_cert
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft void
.Fo X509_STORE_CTX_set_current_cert
.Fa "X509_STORE_CTX *ctx"
.Fa "X509 *cert"
.Fc
.Ft X509 *
.Fo X509_STORE_CTX_get0_current_issuer
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft X509_CRL *
.Fo X509_STORE_CTX_get0_current_crl
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft X509_STORE_CTX *
.Fo X509_STORE_CTX_get0_parent_ctx
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft int
.Fo X509_STORE_CTX_get_num_untrusted
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft STACK_OF(X509) *
.Fo X509_STORE_CTX_get0_chain
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft STACK_OF(X509) *
.Fo X509_STORE_CTX_get_chain
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft STACK_OF(X509) *
.Fo X509_STORE_CTX_get1_chain
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft void
.Fo X509_STORE_CTX_set0_verified_chain
.Fa "X509_STORE_CTX *ctx"
.Fa "STACK_OF(X509) *chain"
.Fc
.In openssl/x509.h
.Ft const char *
.Fo X509_verify_cert_error_string
.Fa "long n"
.Fc
.Sh DESCRIPTION
Most of these functions are typically called after
.Xr X509_verify_cert 3
to inspect status information related to certificate verification.
Some may also be called in a verification callback to determine the
nature of an error.
.Pp
.Fn X509_STORE_CTX_get_error
returns the error code of
.Fa ctx .
See the
.Sy ERROR CODES
section for a full description of all error codes.
.Pp
.Fn X509_STORE_CTX_set_error
sets the error code of
.Fa ctx
to
.Fa s .
For example it might be used in a verification callback to set an error
based on additional checks.
.Pp
.Fn X509_STORE_CTX_get_error_depth
returns the depth of the error.
This is a non-negative integer representing where in the certificate
chain the error occurred.
If it is zero, it occurred in the end entity certificate, one if it is
the certificate which signed the end entity certificate, and so on.
.Pp
.Fn X509_STORE_CTX_set_error_depth
sets the error depth.
This can be used in combination with
.Fn X509_STORE_CTX_set_error
to set the depth at which an error condition was detected.
.Pp
.Fn X509_STORE_CTX_get_current_cert
returns the certificate in
.Fa ctx
which caused the error or
.Dv NULL
if no certificate is relevant.
.Pp
.Fn X509_STORE_CTX_set_current_cert
sets the certificate which caused the error in
.Fa ctx
to the given
.Fa cert .
This value is not intended to remain valid for very long,
and remains owned by the caller.
It may be examined by a verification callback invoked to handle
each error encountered during chain verification and is no longer
required after such a callback.
If a callback wishes the save the certificate for use after it returns,
it needs to increment its reference count via
.Xr X509_up_ref 3 .
Once such a saved certificate is no longer needed, it can be freed with
.Xr X509_free 3 .
.Pp
.Fn X509_STORE_CTX_get0_current_issuer
returns the certificate that caused issuer validation to fail or
.Dv NULL
if no CA certificate is relevant.
.Pp
.Fn X509_STORE_CTX_get0_current_crl
returns the certificate revocation list that caused CRL checking to fail or
.Dv NULL
if no CRL is relevant.
.Pp
When, during certification path validation, the need arises to check
the validity of the certification path of a CRL issuer certificate,
the library creates a new, temporary
.Vt X509_STORE_CTX
object.
If
.Fn X509_STORE_CTX_get0_parent_ctx
is called on that temporary object, a pointer to the original
certification path validation context is returned.
This may be useful in callback functions called from
.Xr X509_verify_cert 3
or from its subroutines to find out whether the callback is called
from the path validation of the target certificate or from the path
validation of a related CRL issuer certificate, and if the latter,
what the target certificate is.
.Pp
.Fn X509_STORE_CTX_get0_chain
returns an internal pointer to a complete validate chain
if a previous call to
.Xr X509_verify_cert 3
was successful.
If the call to
.Xr X509_verify_cert 3
was not successful, the returned chain may be incomplete or invalid.
.Fn X509_STORE_CTX_get_chain
is a deprecated alias of
.Fn X509_STORE_CTX_get0_chain .
.Fn X509_STORE_CTX_get1_chain
returns a deep copy of the same chain which persists even after the
.Fa ctx
structure is freed.
When it is no longer needed, it should be freed using
.Fn sk_X509_pop_free chain X509_free .
.Pp
.Fn X509_STORE_CTX_set0_verified_chain
frees the validate chain generated by if a previous call to
.Xr X509_verify_cert 3 ,
if any, and replaces it with the given
.Fa chain .
Ownership of the
.Fa chain
is transferred to the
.Fa ctx ,
so it should not be freed by the caller.
.Pp
.Fn X509_verify_cert_error_string
returns a human readable error string for verification error
.Fa n .
.Pp
The above functions should be used instead of directly referencing the
fields in the
.Sy X509_VERIFY_CTX
structure.
.Pp
In versions of OpenSSL before 1.0, the current certificate returned by
.Fn X509_STORE_CTX_get_current_cert
was never
.Dv NULL .
Applications should check the return value before printing out any
debugging information relating to the current certificate.
.Pp
If an unrecognised error code is passed to
.Fn X509_verify_cert_error_string ,
"Unknown certificate verification error"
is returned.
This should never happen unless an invalid code is passed.
.Sh RETURN VALUES
.Fn X509_STORE_CTX_get_error
returns
.Dv X509_V_OK
or an error code.
.Pp
.Fn X509_STORE_CTX_get_error_depth
returns a non-negative error depth.
.Pp
.Fn X509_STORE_CTX_get_current_cert ,
.Fn X509_STORE_CTX_get0_current_issuer ,
and
.Fn X509_STORE_CTX_get0_current_crl
return the object which caused the error or
.Dv NULL
if no object of the requested kind is relevant to the error.
.Pp
.Fn X509_STORE_CTX_get0_parent_ctx
returns the parent context or
.Dv NULL
if
.Fa ctx
is not a temporary child context
used for path validation of a CRL issuer certificate.
.Pp
.Fn X509_STORE_CTX_get_num_untrusted
returns the number of untrusted certificates
that were used in building the chain during a call to
.Xr X509_verify_cert 3 .
.Pp
.Fn X509_STORE_CTX_get0_chain ,
.Fn X509_STORE_CTX_get_chain ,
and
.Fn X509_STORE_CTX_get1_chain
return a pointer to a stack of certificates or
.Dv NULL
if an error occurs.
.Pp
.Fn X509_verify_cert_error_string
returns a human readable error string for verification error
.Fa n .
.Sh ERROR CODES
A list of error codes and messages is shown below.
Some of the error codes are defined but currently never returned:
these are described as "unused".
.Bl -tag -width Ds
.It Dv X509_V_OK : No ok
The operation was successful.
.It Dv X509_V_ERR_UNSPECIFIED : \
 No Unspecified certificate verification error
An error was encountered during certificate verification and
the internal routines failed to set a more specific error.
.It Dv X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT : \
 No unable to get issuer certificate
The issuer certificate of a locally looked up certificate could not be found.
This normally means the list of trusted certificates is not complete.
.It Dv X509_V_ERR_UNABLE_TO_GET_CRL : No unable to get certificate CRL
The CRL of a certificate could not be found.
.It Dv X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE : \
 No unable to decrypt certificate's signature
The certificate signature could not be decrypted.
This means that the actual signature value could not be determined
rather than it not matching the expected value.
This is only meaningful for RSA keys.
.It Dv X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE : \
 No unable to decrypt CRL's signature
The CRL signature could not be decrypted: this means that the actual
signature value could not be determined rather than it not matching the
expected value.
Unused.
.It Dv X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY : \
 No unable to decode issuer public key
The public key in the certificate
.Vt SubjectPublicKeyInfo
could not be read.
.It Dv X509_V_ERR_CERT_SIGNATURE_FAILURE : No certificate signature failure
The signature of the certificate is invalid.
.It Dv X509_V_ERR_CRL_SIGNATURE_FAILURE : No CRL signature failure
The signature of the CRL is invalid.
.It Dv X509_V_ERR_CERT_NOT_YET_VALID : No certificate is not yet valid
The certificate is not yet valid: the notBefore date is after the
current time.
.It Dv X509_V_ERR_CERT_HAS_EXPIRED : No certificate has expired
The certificate has expired: that is the notAfter date is before the
current time.
.It Dv X509_V_ERR_CRL_NOT_YET_VALID : No CRL is not yet valid
The CRL is not yet valid.
.It Dv X509_V_ERR_CRL_HAS_EXPIRED : No CRL has expired
The CRL has expired.
.It Dv X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD : \
 No format error in certificate's notBefore field
The certificate notBefore field contains an invalid time.
.It Dv X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD : \
 No format error in certificate's notAfter field
The certificate notAfter field contains an invalid time.
.It Dv X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD : \
 No format error in CRL's lastUpdate field
The CRL thisUpdate field (sic!) contains an invalid time.
Both the name of the error constant and the text of the error message
give a wrong name for the field that contains the problem.
.It Dv X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD : \
 No format error in CRL's nextUpdate field
The CRL nextUpdate field contains an invalid time.
.It Dv X509_V_ERR_OUT_OF_MEM : No out of memory
An error occurred trying to allocate memory.
This should never happen.
.It Dv X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT : No self signed certificate
The passed certificate is self signed and the same certificate cannot be
found in the list of trusted certificates.
.It Dv X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN : \
 No self signed certificate in certificate chain
The certificate chain could be built up using the untrusted certificates
but the root could not be found locally.
.It Dv X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY : \
 No unable to get local issuer certificate
The issuer certificate could not be found: this occurs if the issuer
certificate of an untrusted certificate cannot be found.
.It Dv X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE : \
 No unable to verify the first certificate
No signatures could be verified because the chain contains only one
certificate and it is not self signed.
.It Dv X509_V_ERR_CERT_CHAIN_TOO_LONG : No certificate chain too long
The certificate chain length is greater than the supplied maximum depth.
.It Dv X509_V_ERR_CERT_REVOKED : No certificate revoked
The certificate has been revoked.
.It Dv X509_V_ERR_INVALID_CA : No invalid CA certificate
A CA certificate is invalid.
Either it is not a CA or its extensions are not consistent with the
supplied purpose.
.It Dv X509_V_ERR_PATH_LENGTH_EXCEEDED : No path length constraint exceeded
The basicConstraints path-length parameter has been exceeded.
.It Dv X509_V_ERR_INVALID_PURPOSE : No unsupported certificate purpose
The supplied certificate cannot be used for the specified purpose.
.It Dv X509_V_ERR_CERT_UNTRUSTED : No certificate not trusted
The root CA is not marked as trusted for the specified purpose.
.It Dv X509_V_ERR_CERT_REJECTED : No certificate rejected
The root CA is marked to reject the specified purpose.
.It Dv X509_V_ERR_SUBJECT_ISSUER_MISMATCH : No subject issuer mismatch
The current candidate issuer certificate was rejected because its
subject name did not match the issuer name of the current certificate.
This is only set if issuer check debugging is enabled; it is used for
status notification and is
.Sy not
in itself an error.
.It Dv X509_V_ERR_AKID_SKID_MISMATCH : \
 No authority and subject key identifier mismatch
The current candidate issuer certificate was rejected because its
subject key identifier was present and did not match the authority key
identifier current certificate.
This is only set if issuer check debugging is enabled; it is used for
status notification and is
.Sy not
in itself an error.
.It Dv X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH : \
 No authority and issuer serial number mismatch
The current candidate issuer certificate was rejected because its issuer
name and serial number was present and did not match the authority key
identifier of the current certificate.
This is only set if issuer check debugging is enabled; it is used for
status notification and is
.Sy not
in itself an error.
.It Dv X509_V_ERR_KEYUSAGE_NO_CERTSIGN : \
 No key usage does not include certificate signing
The current candidate issuer certificate was rejected because its
keyUsage extension does not permit certificate signing.
This is only set if issuer check debugging is enabled it is used for
status notification and is
.Sy not
in itself an error.
.It Dv X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER : \
 No unable to get CRL issuer certificate
The CRL's issuer could not be found:
there is no alternative CRL issuer set on
.Ar ctx
and the last certificate in the chain is not self signed.
.It Dv X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION : \
 No unhandled critical extension
The certificate contains a critical extension that is unsupported
by the library.
.It Dv X509_V_ERR_KEYUSAGE_NO_CRL_SIGN : \
 No key usage does not include CRL signing
The CRL issuer has a key usage extension with unset cRLSign bit.
.It Dv X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION : \
 No unhandled critical CRL extension
The CRL contains a critical extension that is unsupported
by the library.
.\" XXX - The following are unreachable (X509_V_ERR_INVALID_NON_CA) or unused.
.\" .It Dv X509_V_ERR_INVALID_NON_CA : \
.\"  No invalid non-CA certificate (has CA markings)
.\" .It Dv X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED : \
.\"  No proxy path length constraint exceeded
.\" .It Dv X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE : \
.\"  No key usage does not include digital signature
.\" .It Dv X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED : \
.\"  No proxy certificates not allowed, please set the appropriate flag
.It Dv X509_V_ERR_INVALID_EXTENSION : \
 No invalid or inconsistent certificate extension
A certificate extension had an invalid value (for example an incorrect
encoding) or some value inconsistent with other extensions.
.It Dv X509_V_ERR_INVALID_POLICY_EXTENSION : \
 No invalid or inconsistent certificate policy extension
A certificate policies extension had an invalid value (for example an
incorrect encoding) or some value inconsistent with other extensions.
This error only occurs if policy processing is enabled.
.It Dv X509_V_ERR_NO_EXPLICIT_POLICY : No no explicit policy
The verification flags were set to require an explicit policy but none
was present.
.It Dv X509_V_ERR_DIFFERENT_CRL_SCOPE : No different CRL scope
The only CRLs that could be found did not match the scope of the
certificate.
.It Dv X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE : \
 No unsupported extension feature
Some feature of a certificate extension is not supported.
Unused.
.It Dv X509_V_ERR_UNNESTED_RESOURCE : \
 No RFC 3779 resource not subset of parent's resources
When walking up a certificate chain, all resources specified in
RFC 3779 extensions must be contained in the resources delegated in
the issuer's RFC 3779 extensions.
The error indicates that this is not the case or that the trust anchor
has inheritance.
.It Dv X509_V_ERR_PERMITTED_VIOLATION : No permitted subtree violation
A name constraint violation occurred in the permitted subtrees.
.It Dv X509_V_ERR_EXCLUDED_VIOLATION : No excluded subtree violation
A name constraint violation occurred in the excluded subtrees.
.It Dv X509_V_ERR_SUBTREE_MINMAX : \
 No name constraints minimum and maximum not supported
A certificate name constraints extension included a minimum or maximum
field: this is not supported.
.It Dv X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE : \
 No unsupported name constraint type
An unsupported name constraint type was encountered.
OpenSSL currently only supports directory name, DNS name, email and URI
types.
.It Dv X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX : \
 No unsupported or invalid name constraint syntax
The format of the name constraint is not recognised: for example an
email address format of a form not mentioned in RFC 3280.
This could be caused by a garbage extension or some new feature not
currently supported.
.\" X509_V_ERR_UNSUPPORTED_NAME_SYNTAX : No unsupported or invalid name syntax
.It Dv X509_V_ERR_CRL_PATH_VALIDATION_ERROR : No CRL path validation error
An error occurred when attempting to verify the CRL path.
This error can only happen if extended CRL checking is enabled.
.It Dv X509_V_ERR_APPLICATION_VERIFICATION : \
 No application verification failure
An application specific error.
This will never be returned unless explicitly set by an application.
.\" .It Dv X509_V_ERR_HOSTNAME_MISMATCH : No Hostname mismatch
.\" .It Dv X509_V_ERR_EMAIL_MISMATCH : No Email address mismatch
.\" .It Dv X509_V_ERR_IP_ADDRESS_MISMATCH : No IP address mismatch
.\" .It Dv X509_V_ERR_INVALID_CALL : \
.\"  No Invalid certificate verification context
.\" .It Dv X509_V_ERR_STORE_LOOKUP : No Issuer certificate lookup error
.\" .It Dv X509_V_ERR_EE_KEY_TOO_SMALL : No EE certificate key too weak
.\" .It Dv X509_V_ERR_CA_KEY_TOO_SMALL : No CA certificate key too weak
.\" .It Dv X509_V_ERR_CA_MD_TOO_WEAK : \
.\"  No CA signature digest algorithm too weak
.El
.Sh SEE ALSO
.Xr X509_STORE_CTX_new 3 ,
.Xr X509_STORE_CTX_set_verify 3 ,
.Xr X509_STORE_CTX_set_verify_cb 3 ,
.Xr X509_STORE_set_verify_cb 3 ,
.Xr X509_up_ref 3 ,
.Xr X509_verify_cert 3
.Sh HISTORY
.Fn X509_STORE_CTX_get_error ,
.Fn X509_STORE_CTX_set_error ,
.Fn X509_STORE_CTX_get_error_depth ,
.Fn X509_STORE_CTX_get_current_cert ,
.Fn X509_STORE_CTX_get_chain ,
and
.Fn X509_verify_cert_error_string
first appeared in SSLeay 0.8.0 and have been available since
.Ox 2.4 .
.Pp
.Fn X509_STORE_CTX_get1_chain
first appeared in OpenSSL 0.9.5 and has been available since
.Ox 2.7 .
.Pp
.Fn X509_STORE_CTX_get0_current_issuer ,
.Fn X509_STORE_CTX_get0_current_crl ,
and
.Fn X509_STORE_CTX_get0_parent_ctx
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Pp
.Fn X509_STORE_CTX_get0_chain
first appeared in OpenSSL 1.1.0 and has been available since
.Ox 6.3 .
.Pp
.Fn X509_STORE_CTX_set_error_depth ,
.Fn X509_STORE_CTX_set_current_cert ,
.Fn X509_STORE_CTX_get_num_untrusted ,
and
.Fn X509_STORE_CTX_set0_verified_chain
first appeared in OpenSSL 1.1.0 and have been available since
.Ox 7.1 .
